Abstract As a vital piece of equipment, electronic voltage transformer is widely used in the power system measurements. The current calibration techniques of this asset class exhibit several issues including complex real time implementation. In contrary with existing calibration techniques, this paper proposes a new correction system for electronic voltage transformers, which can be conducted online without causing any interruption to the electricity grid. The new proposed correction system utilizes an SF6 cylinder capacitor and employs an advanced signal processing technique based on the improved Rife frequency shift algorithm. The improved Rife frequency shift algorithm is a combination of the Hanning self-convolution window and the conventional Rife algorithm, which features simple calculation and high accuracy. Results show that the accuracy of the proposed algorithm is higher than the conventional commonly used interpolation algorithms. Compared with the existing traditional calibration techniques, the proposed system features easy online implementation, simple calculation and high accuracy. The robustness of the proposed system is validated through simulation analysis and practical field measurements.

中文翻译：

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一种电子式电压互感器在线校正系统

摘要 电子式电压互感器作为一种重要的设备被广泛应用于电力系统的测量中。该资产类别的当前校准技术表现出若干问题，包括复杂的实时实施。与现有的校准技术相反，本文提出了一种新的电子电压互感器校正系统，该系统可以在线进行，不会对电网造成任何中断。新提出的校正系统采用 SF6 圆柱电容器，并采用基于改进的 Rife 频移算法的先进信号处理技术。改进的Rife频移算法是Hanning自卷积窗口与传统Rife算法的结合，具有计算简单、精度高等特点。结果表明，所提算法的精度高于常规常用的插值算法。与现有的传统标定技术相比，该系统具有易于在线实现、计算简单、精度高等特点。通过仿真分析和实际现场测量验证了所提出系统的稳健性。